I rarely ever see mag plugs from the factory, only on commercial applications. Check out GoldPlug. I got the trans, oilpan and diff as the first "mods" for my car. Stay away from the blue painted one from ECS I think it was. If anyone cares for an update, I pulled the plug last night (200km) and it was pretty clean. We'll see how it looks after some snow drifting.

As lulz pointed out, just search by car. Verified that all plugs fit on my car two years ago.

Originally Posted by JoshBoody

Isn't the oil pan aluminum? Better to ruin the plug threads. I'll take a closer look.

While I agree, if the plug so happens to shear where the majority is already threaded into the pan, then you have to take off the pan to get the destoryed plug out. Again, you will probably be fine if you dont overtorque it, just seat the washer.

The AP-11 is the plug that is in my oil pan. It is the only plug that is actually "gold" lol. After chosing your model, you can pick either engine, diff or transmission. My diff takes AP-22 and transmission takes AP-05, for my 07 E90 335i.

15k km since the first picture. That's 20k km since the wavtrac install, and the mag plug looks like it has accumulated normal wear.

FWIW, I've swapped fluids 300km ago in favor of Redline 75W140NS, and frankly, it's amazing. The "thump" has been reduced to half of what it was, and shifting is about 10X better than it used to be. It's as if the extra lash that comes with the LSD has been absorbed by the extra thickness of oil. Recommend that anyone in a warm climate give it, or a mix, a try.

So, I am going to toss a "monkey wrench" and say that for LSD, you might want to look into thicker oils. OS Giken makes their own and it is 80W-250.. However, that's a completely different LSD in the way it operates.

Looking at how Wavetrac works, it seems there is a lot of grinding going on when its locking, so this amount of shavings could be normal. The question is: when will it completely wear out and stop locking?

Wavtrac suggests 75W90, and I'm thinking it's too thin. I'm loving the 75W140; it shifts smooth as butter now. I originally went after my trans fluid, but the diff fluid is what made a huge difference. I'm only 400km in now though.

Wavtrac suggests 75W90, and I'm thinking it's too thin. I'm loving the 75W140; it shifts smooth as butter now. I originally went after my trans fluid, but the diff fluid is what made a huge difference. I'm only 400km in now though.

WaveTrac also suggest not to use Redline Oil for some reason, does anybody know why this might be the case?

I have been doing a bit of researching and notice at least for the BMW crowd that everybody tends to use Redline over the recommend Moutol even HP Autowerks. I plan on moving to 75w-140 based on @Tzu mentioned for the improved slight thump when I shift into gear.

Use factory-compatible high performance oils if you wish to upgrade the oil (consult Autotech Driveline for recommendations).

Do NOT use gear oils with friction modifiers or limited slip additives.

Do NOT use Shockproof®1 or similar gear oils designed to reduce friction.

I wonder if Wavetrac would void your warranty if you have used "compatible" but different brand oil? Recommendation on specific oil brand makes me think that Wavetrac has some type of exlusive agreement with them Motul (and they are distributor for it too).

As for oil discussions I believe most of it is pointless unless you have done some oil analyses and compared different fluids under same conditions. I have tried plenty of oils before and without doing an oil analysis all I could tell that there was no difference at all, except in some cases OEM fluid felt better (manual trans fluid on E46 323ci).

Shockproof is a RedLine product meant for true LSDs; given the context I wouldn't be surprised if the comma between 'RedLine' and 'Shockproof' is a typo, and they only meant to exclude that particular line of oils.

The AP-11 is the plug that is in my oil pan. It is the only plug that is actually "gold" lol. After chosing your model, you can pick either engine, diff or transmission. My diff takes AP-22 and transmission takes AP-05, for my 07 E90 335i.

FWIW, the oil pan should only receive oil that has been through the engine oil filter first, sebsequently, you will not see a lot of buildup on that plug. Diffs and transmissions on the other hand, will. My 3rd flush had next to nothing accumulated on the plug. It was likely break in generated material.

@islandroad83 The quiet operation of the diff with 75-140 was great initially, about 5k km later, it's no better than with 75-90. Suspect that the small housing + heat + less oil capacity degrades the oil quickly.

@islandroad83 The quiet operation of the diff with 75-140 was great initially, about 5k km later, it's no better than with 75-90. Suspect that the small housing + heat + less oil capacity degrades the oil quickly.

Good to know, I still have a bit of a clucnk but its not as bad as it was and really sometimes its all how i shift. I replaced all my fluids the other week, Dif, brake, engine, and tranny along with installing all the Gold plugs. After all the fluid changes I noticed everything was so much smoother. Thanks @dzenno@PTF for recommending the Redline Trans shifts awesome now.

Good to know, I still have a bit of a clucnk but its not as bad as it was and really sometimes its all how i shift. I replaced all my fluids the other week, Dif, brake, engine, and tranny along with installing all the Gold plugs. After all the fluid changes I noticed everything was so much smoother. Thanks @dzenno@PTF for recommending the Redline Trans shifts awesome now.

I will be sticking with all those oils from now on for my car. The engine oil can get into a debate over and over but after using the car vibrates a lot less, but don't go using that differential oil unless u have a LSD it's not ment for the stock dif.